* Signing releases (requested by linux distributions)
* Signing commits (actually I don't think anyone actually asked me to do that)
* Authenticating myself with a physical security key. (requested by PyPI)
I found these things easy to automate and they seemed worthwhile to do, and so I don't resent doing them. My sense is that these things are being gradually built in to tools and will become the default without any effort on the part of library maintainers.
So hopefully you'll allow me to sneak in another point! Open source licences create relationships that in political theory would be called anarchism. In software anarchy, anyone's allowed to do anything (or not do anything) they like with their copy of the code. Software is what economists call a non-rivalrous good (ie, multiple people can enjoy it without affecting each other). Anarchy works well with non-rivalrous goods. In contrast, businesses are built around rivalrous goods (ie if you have it, I can't have it), and in this world anarchy doesn't work, and you have to view things through contracts and money.
I think I'll stop there :-)